Tool



Nov. l5, 1949 J. F. KoPczYNsKl TOOL Filed May 3l, 1946 R-M-l www Mm www .N @www1 N @WWW L Mn um m N www .m wm Q Nl) nm. N 4N TM JWN NL MN mm m,

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, l W W W w W .M|l ll 1.|lu| l L ILir f J llllllllllll L Patented Nov. 15, 1949 This invention relates to imhohing` apparatus and particiilarly'to apparatus for' punching successive apertures in a stock or llolzlnk'i'nf 'metalor other material that is fed progtessively'through pui'ichi'ng position.

An object oftheihvention is'to providejan implved and 'simple' Step Whh will` lc'tvely and automatically locate the blank for successive punching operations; whiohwillreouire aiminimum of change in existing constructions morder t Obtain this adde'd llll''; Vvhlh Will be flly automaticl in action and requrelittle iiio atten; tion -in servicing; and which wllbe simple', .practical and inexpensive.

Other objects and advantagesVV 'will'b apparent from the following description of one embodiment of the invention, andthe novel features willy be particularly pointed out hereinafter in connection with the appended claims.

n the accompanying drawing:`

Fig. lisl a sectional elevation o'f `'afpunch constructed in accordance with this inventi'o'mwi'th theparts in# an intermediate step in apunching operation;

Fig.v -2`is asimilar view but .with the .partsn positionsoccupiedat anintermediate step 4in the punchingoperation; and

lg.Y 3 `a similar- View at ing operation. y y

In the illustrated embodiment-ofthe invention, the punch-ing apparatus maybe as any suitable ordesired construction "includingavdie-base- I mounting adie opening 2fwith an enlargecldischarge passage-3 entending from the lower end ofthe opening. 2 through whiohslugs maybe dischargedv A die head Il is mountedas usuali-n punches, for movement 'towards and 'from the base `I and carries in a depending relation thereto a punch element 5 which is aligned Withtheldie peh'ng '2.'V A/'stppi Dle `0 membl- Iwi's` dll-sposed above the base Il either loymouhtihg iton th bs' l 'ifi Vspaced Tlaih t0 -th ilpp'eua 1 of 'the base, or' 'the' stripper member'i '6 AVimay 'be',

the end of. the puncha's shown; a pressure stripper in which it is carther explanation because it isimmatei-iai to this the die opening 2 and the punch ele'ment. This inventionrelates to' improved means for stopping this blankior 'piece of stock Bsuccessively'inldifl ferent vpunching"positions` To this end thebase I is 'provided lwitl'i a recess 9 "opening'thoughrthe upper face iI and having' a'larger recessi below the "rst "mentioned recess 9." A sto'p pin IVI .is sliainglymouhted in the recess-` aand' at its lower end' carries a headil2 which is disposed in the larger recess IIB, so that by engagement o'f head l2 'with' the shoulder. I3, the upward' or. outward movement of the stop pin II may' be limited' to that shown 'in Fig. l; Aspring I4 is disposed in the ybottonirecess III, and is corm'iressed between that'bottom and. the head I2 on the lower end of the pin I I so as 'to' yieldingly urge the. stop" orpin I I into its projectin'grposition shown in Fig. .1 where it lies ih the path'of anadvancing edge of the stock B.

Also mounted on the die head 4 is Va depressing element' or kr'iis'ton I5 which depends parallel'to the punch element 5 and in approximate alignrilentlivi'thV the pin II.' This piston I5eXtends through the strippermember Yand at its lower end is' vsubstaitially'`in advance of the free or lower'uen'd of the punching element '5. The lower end of the piston I5 is smaller in cross sectional area than-'the pin` II, so that when it engages endwise against the pin I I there will-be a shoulder between the lower end of the piston I5 and the top end 'of the pin -I I.- The pistn I5 may'ent'er the recess!) and depress ythe 'pin II ai substantial distaneythe-iecessf I0 being deepe'nough to allowa vvery'fsiilo'stahti'al movement of the pin 4II' downwardly inthe diebase. When the die head 4131's in 'its normal elevated position as shown in Fig. SX-the piston: llvvill be elevatedL aswell -a's tiled-ie 'elemen'tf and 'the pinr I'I will bein its upward projeeting positionfwhere it engages the foiwardedge of 'the 'blank-orA stock B andilirnits its movement.

When the di-lhead 14 'descendsvthep'iston A'I5 will engagewith'the pin Il and depress'it fully into :the 'base I asubstantia'l distanceloef'ore rvthe advancngend of the die element 5 engagesL the blank or--stoe'kByand loefore the stripper' member '6,if a 'pressurestripper as' shown'engages .the sto'ekas shown-iriFi'g. '2; y"'lrhe stocker-"blank B isV urged yife'l'dingly and kcontinuously to' th'el'e'ft in eac'hof'fthe figures, 'and therefore as soon as pin II i's`"depres'sed below the -Surface 'l .of the hase I and'loefore punch 'element 5 engages stock B,"th"e 'stock' will beish'ifted automatically to the leftuiitil the "forward edge engages against the lower' d fth'e piston 'I5 whchs of smaller diameter than the pin II. This will present the forward edge of the blank slightly on top of the outer end face of the pin II, as shown in Fig. 2, and this position of the stock will be maintained While the die head 4 continues to descend, during which the die element 5 will engage the blank and pierce it, the stripper plate engaging the blank at about the same time or just prior thereto.

It will be understood that the stripper member 6 has an aperture I6 through which the piston I5 reciprocates, and it also has another aperture I'I through which the die element 5 moves. After the blank is pierced and as the die head 4 is elevated to the position shown in Fig. 3, the punch element 5 will first be Withdrawn from the blank and during the same upward movement of' the die head 4, the piston I5 will gradually release the pin II. The spring I4 will project the pin II upwardly into the normal position shown in Fig. 1, during which it slightly lifts the advance end of the blank B, as shown in Fig. 3.

As soon as the piston I5 leaves the pin I I, the stock B will be immediately shifted to the left, in the drawings, until the aperture A just formed in the stock, (see Fig. 3) moves into alignment with the pin II. When that happens, the blank or stop B will descend over the pin II and an edge of the perforation will engage edgewise of itself against the pin II and be stopped for a new punching operation, When the die head 4 again descends, the pin Il will be depressed and the blank or stock B will be shifted slightly to the left, until it slightly overruns the end face of the pin II as shown in Fig. 2, lbefore punch element 5 engages the stock B, and then the operation continues as just described. It will be seen that the pusher I5 and stop pin II with their operating mechanism function as cooperating escapement parts or elements and are operated by relative movement of the dies alternately into and out of the path of travel of the blank.

It will be understood that various changes in the details, materials and arrangements of parts, which have been herein described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention, as expressed in the appended claims.

I claim:

l. An automatic stop for stock in perforation punching apparatus which comprises a die base for mounting a female die, a die head for mounting a male die and movable towards and from said base, a stripper disposed above said base, said base having a recess in its face across which the stock moves, a stop pin slidable endwise in and out of said recess and limited in its outward movement to a position in which it projects slightly beyond said face, means resiliently urging said stop outwardly, a pusher carried by said die head for movement therewith toward and from said base, having an advancing end of lesser cross sectional area than the outer end of said pin and movable into endwise engagement with said pin and into said recess, before the male die engages the stock, whereby an edge of the stock stopped by engagement with said pin is released for forward movement until stopped by said pusher in which it overlies the end of said pin when the pusher depresses said stop pin before the male die engages the stock, and the stock is free toadvance across the end of the pin as soon as the pusher leaves the pin.

2. In a punch device of the type having a die base for mounting a female die, a die head movable towards and from said base for mounting a punch element in alignment with said female die, that improvement which comprises said die base having a recess in its face across which the stock is urged edgewise, a stop pin disposed in said recess and yieldingly urged in an outward direction in which its outer end projects into the path of an edge of the stock, but movable well into said recess, and a pusher carried by said head in a position parallel to said punch element for movement therewith, and having its free end in. advance of the punching end of said punch element, aligned with said pin and of substantially smaller cross sectional area than that of said pin, whereby said pin, when engaged by an edge of the stock, limits movement of the stock until the pusher depresses the pin below the die b ase top, and said stock may advance until said edge engages said pusher and slightly overlies the outer end face of said pin before the punch element engages the stock, and when the die head moves away from said base after each punching operation and the pusher element leaves said pin, the stock may move across the endface of the projected pin until another edge of the stock engages against the projecting end of said pin.

3. In a punch device of the type having a die base for mounting a female die, a die head movable towards and from said base for mounting a punch element in alignment with said female die, that improvement which comprises said die base having a recess in its face across which the stock is urged edgewise, a stop pin disposed in said recess and yieldingly urged in an outward direction in which its outer end projects into the path of an edge of the stock but movable well into said recess, a pusher carried by said head in a position parallel to said punch element for movement therewith and having its free end in advance of the punching end of said punch element, aligned with said pin end of substantially smaller cross sectional area than that of said pin, said recess having a shoulder intermediate its outer and inner ends and said pin having a ange engaging said shoulder to limit such outward movement of the pin, and a spring in said recess and resiliently urging said pin outwardly to the extent allowed by engagement of said flange with said shoulder, whereby said pin, when engaged by an edge of the stock, limits movement of the stock until the pusher depresses the pin below the die base top and said stock may advance until said edge engages said pusher and slightly overlies the outer end face of said pin before the punch element engages the stock, and when the die head moves away from said base after each punching operation and the pusher element leaves said pin, the stock may move across the end face of the projected pin until another edge of the stock engages against the projecting end of said pin.

4. An automatic stop for blanks in perforation punching apparatus which comprises a pair of cooperating relatively movable dies between Which a blank to be perforated there-by moves step by step, a stop associated with the relatively stationary one of said dies and movable relatively thereto into and out of the path of said blank at one side of the dies, a spring yieldingly urging said stop into said path, a pusher operated with the relatively moving one of said dies into and out of engagement with said stop and into and out of said path to push said stop out of said path and release it during relative movements of the dies, said pusher and stop having their surfaces which are engaged by the blank offset relatively to each other in the direction of the travel of said blank, whereby relative movements of the stop and pusher will act as an escapement to permit step by step advances of said blank past the dies.

5. An automatic stop for blanks in perforation punching apparatus which comprises a pair of cooperating relatively movable dies between which a blank to be perforated thereby moves step -by step, cooperating escapement parts operated by relative movement of said dies in each punching cycle, alternately into and out of the path of travel of said blank between the dies for alternate engagement with edges of successive apertures in the blank to limit advances of the blank, said parts havingr their surfaces which engage said aperture edges offset in the direction of relative movement of the blank between the dies, whereby the blank will be released for advance movements by the relative movements of the dies.

6. An automatic stop for blanks in perforating mechanism employing relatively moving, cooperating punching dies between which each blank to be perforated moves, step by step, to

6 cause apertures to be punched in succession in the blank, and cooperating escapement parts operated alternately in opposite directions by relative movement of said dies in punching operations for releasing said blank forv controlled, step by step movements between said dies.

'7. An automatic stop for blanks in perforating mechanism employing relatively moving, cooperating punching dies between which a blank to be perforated is moved step by step, a stop resiliently urged into the path of movement of the blank to enter perforations therein and limit advancing movement of the blank, and a member operable with the relatively movable die for engaging said stop and operating it out of the path of said blank, and itself movable into said path and into an aperture of the blank to stop advance of said blank to a selected extent following its release by said stop.

JOHN F. KOPCZYNSKI.

REFERENCES CITD UNITED STATES PATENTS Name Date James 1---- Jan. 4, 1881 Number 

